How do I write a predicate for this in a single xpath? - xslt-2.0

Question

I'm trying to write a function to return a value based on attributes that adhere to a certain logic.
if <Position isAdded="1"> exists then this is what I need.
if <Position isAdded="1"> doesn't exist, and <Position isUpdated=1> exists, that I need this element.
I never should pull <Position isDeleted=1>
If isAdded and isUpdated don't exist, then I need to get the value from
<Position> without any attributes.
This is what I've tried so far
/Root/Effective_Change/Position[not(exists(#isDeleted))][exists(#isAdded)]
get's me the isAdded element.
I can add multiple choose when and test for every attribute. I'm just
trying to see if this can be done in a single xpath. Since there are a lot of elements in my xml, I don't want to do this for every element. Hence
trying to build a function.
Like
/Root/Effective_Change/Position[if (exists(#isAdded then
.[#isAdded]
else if exists(#isUpdated) then
.[#isUpdated] else not(exists(#isDeleted))]
Sample xml
<?xml version="1.0" encoding="UTF-8"?>
<Root>
<Effective_Change Sequence="1">
<Position isUpdated="1">
<Business_Title>Updated Product Engineer</Business_Title>
<Worker_Type>Regular</Worker_Type>
</Position>
<Position isAdded="1">
<Business_Title>Product Engineer</Business_Title>
<Worker_Type>Regular</Worker_Type>
</Position>
<Position isDeleted="1">
<Business_Title>Deleted Product Engineer</Business_Title>
<Worker_Type>Regular</Worker_Type>
</Position>
<Position>
<Business_Title>Product Engineer</Business_Title>
<Worker_Type>Regular</Worker_Type>
</Position>
</Effective_Change>
</Root>
The actual file can have these attributes at multiple levels. for
example:
<Position isUpdated="1">
<Business_Title>Updated Product Engineer</Business_Title>
<Worker_Type isDeleted="1">Temporary</Worker_Type>
<Worker_Type isAdded="1">Regular</Worker_Type>
</Position>
I use this function to get non-deleted data
<xsl:function name="this:getNonDeletedElement">
<xsl:param name="element"/>
<xsl:variable name="nodeName">
<xsl:value-of select="$element[1]/name()"/>
</xsl:variable>
<xsl:choose>
<xsl:when test="exists($element/ancestor::*[name() = 'Effective_Change']//*[not(exists(#isDeleted))]/*[name() = $nodeName][not(exists(#isDeleted))])">
<xsl:value-of select="$element/ancestor::*[name() = 'Effective_Change']//*[not(exists(#isDeleted))]/*[name() = $nodeName][not(exists(#isDeleted))]"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="''"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
This function, however, would still return isAdded, isUpdated and non-attributed rows. In that case, if isAdded exists, I need that, if isAdded doesnt exist and isUpdated does, then I need that, else the non-attributed row.
I'm using this to check for isAdded
<xsl:function name="this:isElementAdded">
<xsl:param name="element"/>
<xsl:choose>
<xsl:when test="$element/../#isAdded or $element/#isAdded or exists($element/ancestor::*[#isAdded and name(..)='Effective_Change'])">
<xsl:value-of select="true()"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="false()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
I'm wondering if there's a simpler way to doing this.